/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.mpp.transformation.dag.udf;

import org.apache.iotdb.commons.udf.service.UDFClassLoaderManager;
import org.apache.iotdb.db.mpp.plan.expression.Expression;
import org.apache.iotdb.db.mpp.plan.expression.multi.FunctionExpression;

import java.time.ZoneId;
import java.util.HashMap;
import java.util.Map;

public class UDTFContext {

    protected final ZoneId zoneId;

    protected Map<String, UDTFExecutor> expressionName2Executor = new HashMap<>();

    public UDTFContext(ZoneId zoneId) {
        this.zoneId = zoneId;
    }

    public void constructUdfExecutors(Expression[] outputExpressions) {
        for (Expression expression : outputExpressions) {
            expression.constructUdfExecutors(expressionName2Executor, zoneId);
        }
    }

    public void finalizeUDFExecutors(long queryId) {
        try {
            for (UDTFExecutor executor : expressionName2Executor.values()) {
                executor.beforeDestroy();
            }
        } finally {
            UDFClassLoaderManager.getInstance().finalizeUDFQuery(queryId);
        }
    }

    public UDTFExecutor getExecutorByFunctionExpression(FunctionExpression functionExpression) {
        return expressionName2Executor.get(functionExpression.getExpressionString());
    }
}
